package my.mybatis.common.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.UUID;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;


/**
 * 类说明 文件的压缩与解压
 * @author wangbin
 */
public class DecompressionZip {
    private static final Logger LOGGER = LoggerFactory.getLogger(DecompressionZip.class);

	/**
     * 压缩文件
     * 
     * @param filePath
     *            待压缩的文件路径
     * @return 压缩后的文件
     */
    public static File zip(String filePath) {
        File target = null;
        File source = new File(filePath);
        if (source.exists()) {
            // 压缩文件名=源文件名.zip
            String zipName = source.getName() + ".zip";
            target = new File(source.getParent(), zipName);
            if (target.exists()) {
                target.delete(); // 删除旧的文件
            }
            FileOutputStream fos = null;
            ZipOutputStream zos = null;
            try {
                fos = new FileOutputStream(target);
                zos = new ZipOutputStream(new BufferedOutputStream(fos));
                // 添加对应的文件Entry
                addEntry("", source, zos);
            } catch (IOException e) {
                throw new RuntimeException(e);
            } finally {
                try {
                    if(fos != null)
                        fos.close();
                } catch (IOException e) {
                    LOGGER.error("~~~~~~~~~DecompressionZip 关闭 FileOutputStream fos 失败~~~~~~~~~~");
                    e.printStackTrace();
                }
                try {
                    if(zos != null)
                        zos.close();
                } catch (IOException e) {
                    LOGGER.error("~~~~~~~~~DecompressionZip 关闭 ZipOutputStream zos 失败~~~~~~~~~~");
                    e.printStackTrace();
                }
            }
        }
        return target;
    }
 
    /**
     * 扫描添加文件Entry
     * 
     * @param base
     *            基路径
     * 
     * @param source
     *            源文件
     * @param zos
     *            Zip文件输出流
     * @throws IOException
     */
    private static void addEntry(String base, File source, ZipOutputStream zos)
            throws IOException {
        // 按目录分级，形如：/aaa/bbb.txt
        String entry = base + source.getName();
        if (source.isDirectory()) {
            for (File file : source.listFiles()) {
                // 递归列出目录下的所有文件，添加文件Entry
                addEntry(entry + "/", file, zos);
            }
        } else {
            FileInputStream fis = null;
            BufferedInputStream bis = null;
            try {
                byte[] buffer = new byte[1024 * 10];
                fis = new FileInputStream(source);
                bis = new BufferedInputStream(fis, buffer.length);
                int read = 0;
                zos.putNextEntry(new ZipEntry(entry));
                while ((read = bis.read(buffer, 0, buffer.length)) != -1) {
                    zos.write(buffer, 0, read);
                }
            } finally {
                try {
                    if(fis != null)
                        fis.close();
                } catch (IOException e) {
                    LOGGER.error("~~~~~~~~~DecompressionZip 关闭 FileInputStream fis 失败~~~~~~~~~~");
                    e.printStackTrace();
                }
                try {
                    if(bis != null)
                        bis.close();
                } catch (IOException e) {
                    LOGGER.error("~~~~~~~~~DecompressionZip 关闭 BufferedInputStream bis 失败~~~~~~~~~~");
                    e.printStackTrace();
                }
                zos.closeEntry();
            }
        }
    }
 
    /**
     * 解压文件
     * 
     * @param filePath
     *            压缩文件路径
     */
    public static void unzip(String filePath) {
        File source = new File(filePath);
        if (source.exists()) { 
            ZipInputStream zis = null;
            BufferedOutputStream bos = null;
            try {
                zis = new ZipInputStream(new FileInputStream(source));
                ZipEntry entry = null;
            	while ((entry = zis.getNextEntry()) != null && !entry.isDirectory()) {
            		String filename = UUID.randomUUID() + entry.getName().substring(entry.getName().lastIndexOf("."));
                    File target = new File(source.getParent(), filename);
                    if (!target.getParentFile().exists()) {
                        // 创建文件父目录
                        target.getParentFile().mkdirs();
                    }
                    // 写入文件
                    bos = new BufferedOutputStream(new FileOutputStream(target));
                    int read = 0;
                    byte[] buffer = new byte[1024 * 10];
                    while ((read = zis.read(buffer, 0, buffer.length)) != -1) {
                        bos.write(buffer, 0, read);
                    }
                    bos.flush();
                }
                zis.closeEntry();
            } catch (IOException e) {
                throw new RuntimeException(e);
            } finally {
                try {
                    if(zis != null)
                        zis.close();
                } catch (IOException e) {
                    LOGGER.error("~~~~~~~~~DecompressionZip 关闭 ZipInputStream zis 失败~~~~~~~~~~");
                    e.printStackTrace();
                }
                try {
                    if(bos != null)
                        bos.close();
                } catch (IOException e) {
                    LOGGER.error("~~~~~~~~~DecompressionZip 关闭 BufferedOutputStream bos 失败~~~~~~~~~~");
                    e.printStackTrace();
                }
            }
        }
    }
    
    public static void main(String[] args) {
        String filePath_prefix = Class.class.getClass().getClass().getResource("/").getPath();
        String targetPath = filePath_prefix+"1512530746296";
        File file = DecompressionZip.zip(targetPath);
        System.out.println(file);
    	//DecompressionZip.unzip("F:\\My work file\\Amazon\\pdf_zip\\1495430495001.zip");
    }
}
